Sample Trial Paper - Difficulty: Hard

Multiple choice (20 marks)

1. What is the IUPAC name of the following compound?

(A) 1,3-dichloro-2-fluoro-2,3-dibromopropane

(B) 1,2-dibromo-2-fluoro-1, 3- dichloropropane

(D) 2,3-dibromo-1,3-dichloro-2-fluoropropane

2. Ethanol is often called a “universal solvent” since it can dissolve both polar and nonpolar solutes.

Which property of ethanol makes it a suitable solvent for both organic and inorganic

substances?

(A) It is a small polar molecule so it can easily dissolve any polar molecule.

(B) It is a small non-polar molecule so it can easily dissolve any non-polar molecule and all polar molecules are soluble

(D) It is a small molecule with low density and a low boiling point so it has sufficient energy to dissolve any molecule.

3. Ethylene is obtained in industry from petroleum fractions.

C₁₀H_{22 (l)}→ C₈H_{18 (l)} + C₂H_{4 g)}

What is the name of this process?

(A) catalysis

(B) Catalytic cracking

(D) polymerisation

4. Amino acids undergo polymerisation to produce proteins. Amino acids usually contain an amine and a carboxylic acid functional group.

Which substance is one of the products of this process?

(A) water

(B) carbon dioxide

(D) oxygen

5. An organic liquid, when reacted with concentrated sulfuric acid, produces a

compound that immediately decolourises bromine water.

What is the formula of the organic liquid?

(A) C4H8

(B) C4H10

(D) C4H9O

6. Which of the following compounds are amphiprotic?

(A) NH₃

(B) H₂SO₄

(D) NaOH

7. What is the purpose of using concentrated sulfuric acid in esterification reactions?

(A) to catalyse the reaction

(B) to dehydrate the system

(D) to push the equilibrium to the right

Use the following titration curve for question 8 and 9

8. This graph could represent the reaction between which two chemicals?

(A) HCl and NH3

(B) HCl and NaOH

(D) CH3COOH and NH3

9. What would be a suitable indicator to use in the above reaction?

(A) Thymol Blue

(B) Methyl Red

(D) Phenolphthalein

10. Biopolymers appear to be an ever increasing product which is attracting a lot of beneficial attention.

What is one major reason for this?

(A) Biopolymers are more energy efficient in production.

(B) Biopolymers are cheap to produce.

(D) Biopolymers are easy to produce.

11. A 0.1 mol L-1 HCl solution has a pH of 1.0. What volume of water must be added to

10.0 mL of this solution to obtain a final pH of 2.0?

(A) 90 mL

(B) 100 mL

(D) 900 mL

12. Calculate the volume of ethanol produced from the fermentation of 90.0 g of glucose

at 25oC. The density of ethanol is 0.79 g mL-1.

(A) 18.18 mL

(B) 24.8 mL

(D) 46.0 mL

13. In a reaction, 30.0mL of a 0.106 molL^-1 NaOH is added to 25.0 mL of 0.100

molL-1 HCl solution.

What will be the pH of the final solution?

(A) 4.00

(B) 7.00

(D) 12.1

14. A mixture of brown NO2 and N2O4 gases in a rigid vessel reaches equilibrium

according to the equation:

What effect does raising the temperature have on the colour of gases in the vessel?

(A) There will be no change in the colour as the system is in equilibrium.

(B) The brown colour will fade because the forward reaction is exothermic.

(D) The brown colour will intensify because the forward reaction is endothermic.

15. Polymers are composed of repeating chains of monomers. The following polymer is created from which hydrocarbon repeated in a chain?

Ethene
Propene
Propane
1-methylethene

16. Ethanol has a heat of combustions of 1346 kJ mol^-1

What mass of ethanol would be required to produce 500 kJ of energy upon complete combustion?

(A) 0.38 g

(B) 10.76 g

(D) 495.32 g

17. Which of the following molecules would be classed an acid by Lavoisier’s definition.

18. Inorder to carry out an accurate titration, the equipment is used. The following titration is used to determine the concentration of ethanoic acid using potassium hydroxide as the primary standard solution. If the burette conical flask contains potassium hydroxide, what should each equipment be rinsed with?

19. A student was undecided about the sulphate content of lawn. He was tossing up whether to use AAS or gravimetric analysis. If he decided to use gravimetric analysis to determine the concentration of sulphate, which reagent should he use.

Iron Sulphate
Sodium Sulphate
Barium Carbonate
Barium Chloride

20) The concentration of CO₂in the troposphere over a mie field is measured to be 2.56 *10^(-5) mol L^-1

Assuming the conditions are 25 degrees celcius and 100 kPa, what is the concentration in ppm?

0.0634 ppm
0.634 ppm
634 ppm
634000 ppm

Short Answer Section.

Question 21 (6 marks)

(a) Draw a flow chart diagram to show the industrial processes involved in the

production of ethanol from sugar cane. 4

(b) Justify ONE condition required to promote the fermentation of sugar. 2 marks

…………………………………………………………………………………………………..

Question 22 (7 marks)

The yield of product in the Haber process is based on a delicate balancing act involving

reaction energy, reaction rate and equilibrium.

Evaluate the conditions used in this process.

…………………………………………………………………………………………………..

Question 23 (7 marks)

(a) Outline ONE use of esters. 1 mark

…………………………………………………………………………………………………..

(b) Write a balanced chemical equation using structural formula to show the reaction

between 1-heptanol and pentanoic acid. 3 mark

…………………………………………………………………………………………………..

………………………………………………………………………………………………..

Name the organic product formed in this reaction 1 mark

…………………………………………………………………………………………………..

Identify two risks and how to manage them in this reaction process. 2 mark

…………………………………………………………………………………………………..

Question 24 (8 marks)

A student determined the molar heat of combustion of ethanol using a spirit-burner, an

aluminium can containing 300.0g water, a thermometer and an electronic balance.

The following results were recorded.

Initial mass of burner 113.20g

Final mass of burner 122.05g

Initial temperature of water 21.60C

Final temperature of water 45.50C

(a) Use the data to calculate the molar heat of combustion of ethanol. 4 marks

…………………………………………………………………………………………………..

(b) The calculated molar heat of combustion is much less than the correct value. Suggest reasons for the low value obtained. 4 marks

Question 25 (8 marks)

The list below contains acids, bases and salts.

H2SO4, Na2CO3, NH4Cl, HCl, CH3COOH, NaOH, NH3, BaOH

(a) Identify the two species which would react together to form a basic salt. 1 mark

…………………………………………………………………………………………………..

(b) Outline how a buffer solution could be prepared from two or more of the above

compounds. 2 mark

…………………………………………………………………………………………………..

(3) With the aid of reaction equations, explain the usefulness of a buffer solution and how they work. (5 marks)

…………………………………………………………………………………………………..

Question 29 (3 marks)

During a reaction between solid sodium hydrogen carbonate and sulfuric acid 148.35 mL of a

gas were collected. The reaction was carried out at 25oC and 100 kPa.

Calculate the mass of solid sodium hydrogen carbonate that reacted to produce this volume of

gas. 3

…………………………………………………………………………………………………..

Question 31 (11 marks)

In an investigation to determine the concentration of acetic acid in vinegar, the following

steps were undertaken:

1. 50.00 mL sample of vinegar was diluted with demineralised water to make 500.0 mL of dilute vinegar solution.

2. 25.00 mL aliquots of the diluted vinegar were then titrated against 0.1 M barium hydroxide solution.

3. The results were tabulated.

Titration	Volume of 0.1 M BaOH (mL)
Rough	30.10
1	26.10
2	25.90
3	27.30
4	25.60

(a) Calculate the original concentration of acetic acid in the vinegar in molL-1. 4

…………………………………………………………………………………………………..

(b) Explain what is required for a primary standard and whether barium hydroxide is a suitable one. 3

…………………………………………………………………………………………………..

(d) Propose a way to increase the reliability of this experiment. 2

…………………………………………………………………………………………………..

Question 32 (10 marks)

The following flow chart shows a series of reactions.

What is the possible product for Q and R 2

…………………………………………………………………………………………………..

Explain what product R could be used for and justify its molecular structure for this use. 8

…………………………………………………………………………………………………..

Question 33 (7 marks)

Atomic absorption spectroscopy(AAS) is a method which can accurately detect concentrations of different ions.

Evaluate the impact of AAS on society and the environment and explain how it works.

Question 34 (9 marks)

(a) Glyceryl trilaurate can be used in the production of the soap sodium laurate.

(i) Identify the reactants and products in a saponification reaction? 4

(ii) Explain with the use of a diagram how soap is an effective cleaning agent. 5 marks

Question 35 (4 marks)

Initially, a mixture of 0.200 molL-1 NO, 0.010 molL-1 H2 and 0.200 molL-1 H2O was

allowed to reach equilibrium. At equilibrium the concentration of NO was found to be

0.052 molL-1. Calculate the value of the equilibrium constant for the reaction. 3

Answers

Sample Trial Paper – Difficulty: Hard

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